Patent US2575329A successfully refreshed from Google Patents.
US2575329A
Expired / Lapsed
US
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Telegraph switching system
Assignee: Western Union Telegraph Co
•
Filing: 1949-08-02
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Granted: 1951-11-20
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Expires: 1969-08-02
Abstract
No abstract record available.
Inventors
- 👤 William B Blanton
- 👤 George G Light
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:47
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1738564A
Cited
US1970337A
Cited
US2193967A
Cited
US2088750A
Cited
US2293704A
Cited
US2369935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |